[Devel] [PATCH RHEL7 COMMIT] bonding: show full hw address in sysfs for slave entries

[Konstantin Khorenko]

The commit is pushed to "branch-rh7-3.10.0-957.10.1.vz7.85.x-ovz" and will appear at https://src.openvz.org/scm/ovz/vzkernel.git
after rh7-3.10.0-957.10.1.vz7.85.4
------>
commit b8625c72e2eb70fb73499ef06c7194feda48779c
Author: Konstantin Khorenko <khorenko at virtuozzo.com>
Date:   Wed Mar 27 19:10:54 2019 +0300

    bonding: show full hw address in sysfs for slave entries
    
    Bond expects ethernet hwaddr for its slave, but it can be longer than 6
    bytes - infiniband interface for example.
    
     # cat /sys/devices/<skipped>/net/ib0/address
     80:00:02:08:fe:80:00:00:00:00:00:00:7c:fe:90:03:00:be:5d:e1
    
     # cat /sys/devices/<skipped>/net/ib0/bonding_slave/perm_hwaddr
     80:00:02:08:fe:80
    
    So print full hwaddr in sysfs "bonding_slave/perm_hwaddr" as well.
    
    https://jira.sw.ru/browse/PSBM-93117
    
    Signed-off-by: Konstantin Khorenko <khorenko at virtuozzo.com>
---
 drivers/net/bonding/bond_sysfs_slave.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/net/bonding/bond_sysfs_slave.c b/drivers/net/bonding/bond_sysfs_slave.c
index 2f120b2ffef0..4985268e2273 100644
--- a/drivers/net/bonding/bond_sysfs_slave.c
+++ b/drivers/net/bonding/bond_sysfs_slave.c
@@ -55,7 +55,9 @@ static SLAVE_ATTR_RO(link_failure_count);
 
 static ssize_t perm_hwaddr_show(struct slave *slave, char *buf)
 {
-	return sprintf(buf, "%pM\n", slave->perm_hwaddr);
+	return sprintf(buf, "%*phC\n",
+		       slave->dev->addr_len,
+		       slave->perm_hwaddr);
 }
 static SLAVE_ATTR_RO(perm_hwaddr);